Examining the Contact Filter Paper Method in the Low Suction Range

Leong, Eng Choon; Wijaya, Martin; Tong, Wei; Lu, Yan

doi:10.1520/gtj20190237

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…The chilled mirror hygrometer can fairly rapidly measure suctions, but it is typically only used to determine the portion of the SWRC corresponding to higher suctions (>1,000 kPa) and lower water contents. The FPM applies to the entire range of the SWRC suctions and water contents but does not provide high precision at low suctions and high water contents (Leong et al 2020). The long equilibration times required makes the FPM a slow procedure.…”

Section: Conventional Methods For Determining Swrcsmentioning

confidence: 99%

Performance of the Tensiometer Method for the Determination of Soil-Water Retention Curves in Various Soils

Roux

Jacobsz

2021

Geotechnical Testing Journal

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The soil-water retention curve (SWRC) describes the relationship between the soil matric suction and the water content of an unsaturated soil. It is an essential tool in geotechnical engineering and agriculture and is, for example, used in the analysis of unsaturated soil conditions such as those found in tailings dams and in analyzing the water retention capacity of agricultural land. Conventional methods used to obtain the SWRC are laborious and often rely on empirically derived equations to describe the curve. These test procedures can take weeks to complete and usually rely on indirect methods of measuring suction. Recent advances in the development of affordable high-capacity tensiometers (HCTs), the only devices capable of producing a direct and continuous measurement of high matric suctions, enable the introduction of the tensiometer method for the rapid determination of continuous SWRCs. The method requires an HCT, a digital laboratory balance, and a means of sample volume measurement if volume changes are relevant. The method involves continuously monitoring the mass and matric suctions generated in a naturally desaturating soil sample. The method has thus far seen limited implementation owing to the need for measuring specimen volume change to describe the hydraulic and volumetric behavior fully. The performance of the tensiometer method was investigated by determining SWRCs of five different soil types and then comparing them to the SWRCs determined from the filter paper method. A novel method, based on photogrammetry, was adopted for volume change measurement to produce SWRCs for soils that undergo shrinkage during drying. Excellent agreement between the methods was found for both the nonplastic soils and plastic soils tested.

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Section: Conventional Methods For Determining Swrcsmentioning

confidence: 99%

Performance of the Tensiometer Method for the Determination of Soil-Water Retention Curves in Various Soils

Roux

Jacobsz

2021

Geotechnical Testing Journal

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“…The matrix suction tests, based on the procedures of Marinho (1995) and interpreted using the model of Chandler et al (1992) and Leong et al (2002), showed values of matrix suction up to 4000 kPa. Due to the unsaturated conditions of the reinforcement layer, the parameter c' was corrected.…”

Section: Numerical Model Conditionsmentioning

confidence: 99%

Application of Dynamic Replacement to Lateritic Clay

et al. 2023

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The dynamic replacement (DR) method is a widespread alternative in several countries around the world as a technique to improve soils with low bearing capacity, compressible, collapsible, etc. It is an established method used on soft clays, silts, sandy silt, and/or sedimentary sandy soils with low bearing capacity. However, there are no published scientific reports on the use of this method on saprolite and/or laterite soils typical of tropical regions.Therefore, this paper aims to validate the use of the Mohr-Coulomb failure criterion using the finite element method (FEM) as a tool for predicting the elastoplastic behavior of lateritic clayey soils improved by the dynamic replacement method. For this purpose, 6 plate loading tests were performed on DR columns with and without cement-improved soil reinforcement layers (fine sand + Portland cement) with different heights and different DR column depths were numerically simulated in FEM based on the Mohr-Coulomb criterion. It was concluded that the use of the Mohr-Coulomb plastification criterion in FEM generated numerical simulations compatible with the responses of plate load tests performed in the field. In general, it was observed that the

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“…ASTM D5298 [26] only provides one calibration curve for both matric and total suction determinations, however there have been many studies that showed that for Whatman 42 filter paper, two sets of calibration should be adopted for matric and total suction respectively [28].…”

Section: Water Retention Behaviourmentioning

confidence: 99%